iOS (Jailbroken): The volume HUD that pops up in iOS isn't especially useful, and if you're curious about what song is playing you need to pop into the Music app and look. Music HUD is a tweak that adds the currently playing album's image to the volume overlay, as well a few other pieces of useful information.

Jailbreaking is a process that changes little by little with each iOS upgrade. Rather than always…
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In Music HUD's settings you can customize how it works. At first, it just shows you the currently playing album when you hit the volume knob, but you can also add the album title, a subtitle, and a couple gestures to instantly mute or open up the Music app.